Abstract

The content of Chl a and nutrients in the Upper Volga reservoirs in the summer of 2015–2018 has been studied. With Chl a content typical of the summer phytoplankton maximum (from 19.9 ± 3.9 to 48.0 ± 12.0 μg/L), the reservoirs are classified as eutrophic; the Rybinsk Reservoir was classified as mesotrophic only in cool 2017 (10.3 ± 4.7 μg/L). The content of nutrients (from 0.71 ± 0.06 to 1.54 ± 0.07 mg/L N_tot and from 51 ± 12 to 106 ± 3 μg/L P_tot) also corresponds to the eutrophic status of the Upper Volga reservoirs. The average values of the N_tot/P_tot ratio (11–16) indicate the absence of the biogenic limitation of phytoplankton, and a deficiency of nutrients was recorded only in the Rybinsk Reservoir in August 2015 and 2016 and the Ivankovo Reservoir in 2015. In most cases, low values of correlation coefficients (r < 0.7) were noted between the Chl a and nutrients, indicating the complex and multicomponent effect of the latter on phytoplankton. Multiple correlation analysis confirms the high importance of hydrological conditions for the development of autotrophic plankton of the Upper Volga reservoirs.

中文翻译：

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伏尔加河上游水库浮游植物发展中的生物成因及其意义

摘要

叶绿素的含量一，并在2015 - 2018年的夏天，伏尔加河上游水库的营养物质进行了研究。与叶绿素一个（至48.0±12.0微克/升从19.9±3.9）典型夏季浮游植物最大的内容时，储存器被分类为富营养; 雷宾斯克水库仅在2017年凉爽（10.3±4.7μg/ L）时被列为中营养。营养物的含量（从0.71±0.06到1.54±0.07 mg / LN _tot和从51±12到106±3μg/ LP _tot）也对应于上伏尔加河水库的富营养化状态。N _tot / P _tot的平均值比率（11–16）表明没有浮游植物的生物限制，仅在2015年8月和2016年的雷宾斯克水库和2015年的伊万科沃水库中记录到养分缺乏。在大多数情况下，相关系数值低（[R <0.7）中的叶绿素之间注意到一个和营养物，这表明后者的浮游植物的复杂和多效果。多重相关分析证实了水文条件对于上伏尔加河水库自养浮游生物发展的高度重要性。